The possible causes of extinction of Steller's sea cow are explained by the passage. However, the lecture completely disagrees with the reasonings given by the passage providing some explanations.
Firstly, the passage claims that overhunting of sea cows by the groups of native Siberian people had cause the extinction. In contrast, the lecture affirms that the animal was so massive in size weighing about tens tons which would be more than enough to feed the entire group of people for a month. Therefore, overhunting could not be the cause.
Secondly, the passage talks about the ecosystem disturbance which led to the decline in seafoods (kelps) for the cows causing decline in number. But the lecture says the cause is inconsequential and if there was imbalance in the ecosystem of Bering island, other marine animals would also be affected. There was no any decline in other animals and even kelps were growing well. Thus, the second cause is ruled out by the passage.
Thirdly, the passage contends hunting of sea cows for fur trading by the Europeans had cause the decline of sea cows. The lecture, in other hand, explains that their numbers were relatively low before the arrival of Europeans. So, they could not be taken as the cause being last to arrive in the island.
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Grammar and spelling errors:
Line 3, column 102, Rule ID: HAD_VBP[1]
Message: Possible agreement error -- use past participle here: 'caused'.
Suggestion: caused
...he groups of native Siberian people had cause the extinction. In contrast, the lectur...
^^^^^
Line 3, column 180, Rule ID: ADJECTIVE_IN_ATTRIBUTE[1]
Message: A more concise phrase may lose no meaning and sound more powerful.
Suggestion: massive
... lecture affirms that the animal was so massive in size weighing about tens tons which would be...
^^^^^^^^^^^^^^^
Line 5, column 311, Rule ID: NOW[2]
Message: Did you mean 'now' (=at this moment) instead of 'no' (negation)?
Suggestion: now
...imals would also be affected. There was no any decline in other animals and even k...
^^
Line 7, column 88, Rule ID: HAD_VBP[1]
Message: Possible agreement error -- use past participle here: 'caused'.
Suggestion: caused
...ws for fur trading by the Europeans had cause the decline of sea cows. The lecture, i...
^^^^^
Transition Words or Phrases used:
also, but, first, firstly, however, if, second, secondly, so, therefore, third, thirdly, thus, well, in contrast
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 13.0 10.4613686534 124% => OK
Auxiliary verbs: 4.0 5.04856512141 79% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 5.0 12.0772626932 41% => More relative clauses wanted.
Pronoun: 5.0 22.412803532 22% => OK
Preposition: 30.0 30.3222958057 99% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 1071.0 1373.03311258 78% => OK
No of words: 216.0 270.72406181 80% => More content wanted.
Chars per words: 4.95833333333 5.08290768461 98% => OK
Fourth root words length: 3.83365862548 4.04702891845 95% => OK
Word Length SD: 2.55400768341 2.5805825403 99% => OK
Unique words: 124.0 145.348785872 85% => More unique words wanted.
Unique words percentage: 0.574074074074 0.540411800872 106% => OK
syllable_count: 335.7 419.366225166 80% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 3.25607064018 31% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 18.0 21.2450331126 85% => The Avg. Sentence Length is relatively short.
Sentence length SD: 38.8482625094 49.2860985944 79% => OK
Chars per sentence: 89.25 110.228320801 81% => OK
Words per sentence: 18.0 21.698381199 83% => OK
Discourse Markers: 9.33333333333 7.06452816374 132% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 4.0 4.19205298013 95% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 7.0 4.27373068433 164% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.375766184234 0.272083759551 138% => OK
Sentence topic coherence: 0.142166812275 0.0996497079465 143% => OK
Sentence topic coherence SD: 0.121019421043 0.0662205650399 183% => OK
Paragraph topic coherence: 0.231718593434 0.162205337803 143% => OK
Paragraph topic coherence SD: 0.0312157039018 0.0443174109184 70% => OK
Essay readability:
automated_readability_index: 10.9 13.3589403974 82% => Automated_readability_index is low.
flesch_reading_ease: 53.21 53.8541721854 99% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.3 11.0289183223 93% => OK
coleman_liau_index: 11.19 12.2367328918 91% => OK
dale_chall_readability_score: 8.33 8.42419426049 99% => OK
difficult_words: 52.0 63.6247240618 82% => More difficult words wanted.
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 9.2 10.498013245 88% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
---------------------
Rates: 71.6666666667 out of 100
Scores by essay e-grader: 21.5 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.